Method, System and Device for Providing Flow Control in a Split Bearer Environment

3. The method of claim 1, wherein the expected queuing times are used for determining forwarding of the flow of PDCP PDUs destined for the UE on the internode interface to the second network node.

4. The method of claim 1, wherein the expected queuing times are used for determining forwarding of the flow of PDCP PDUs destined for the UE on a wireless link from the first network node to the UE.

5. The method of claim 1, wherein the expected queuing time represents packet delay in relation to packet transmission for at least one of the first network node and the second network node.

6. The method of claim 5, wherein the packet delay is related to delay of the internode interface for packet transmission from the first network node to the second network node.

7. The method of claim 1, wherein the forwarding of the flow of PDCP PDUs destined for the UE further is determined according to delay of the internode interface for packet transmission from the first network node to the second network node.

8. The method of claim 7, wherein the first network node requests the second network node to submit the delay for packet transmission from the first network node to the second network node to the first network node.

9. The method of claim 7, wherein the delay for packet transmission from the first network node to the second network node is determined based on timestamps associated with a PDCP PDU forwarded by the first network node on the internode interface, at least one of the timestamps being set by the first network node.

10. The method of claim 7, wherein the delay for packet transmission from the second network node to the first network node is determined based on timestamps associated with a feedback report transmitted by the second network node on the internode interface, at least one of the timestamps being set by the second network node.

11. The method of claim 1, wherein a fluid approximation is made to estimate buffer queuing states at the second network node, and wherein the fluid approximation relates to an incoming data rate of PDCP PDUs destined for the UE at the second network node and outgoing service rate at the second network node.

14. The method of claim 13, wherein the queue data volume at time t+TDL at the second network node, where TDL is a delay of the internode interface, is determined as a sum of received current queue data volume at the second network node, data volume forwarded to the internode interface for transmission to the second network node during a time related to the delay, and queue data volume transmitted via the second network node to the UE during a time related to the delay.